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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b1c1fda0c472d60dbb82df8c9f03545f9f9e9dc1c354f28160d35a0c0ebd0c4' 
  AND token = 'SO0cR8AsD9h6i19AbNCVrGFcvMFIh2Fzh5tuhu2qels=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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