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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f317943cec8c746d2b0fd97242f0461506d96cd1fb348975229cef04c44f7c3b' 
  AND token = 'vsPZAumnaptg7WYT99mfvyQiWomaIvhLwR7Eyx3Vipg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}