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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e82fb7a68da4e03f970f02d7b300d0a802ac29d45ed5d7bda07e0a2e2d010f6' 
  AND token = 'Tgmsym6g9jEED2f9HTfiheVWvCzTCmzCNvYtCksSWtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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