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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfaadf2ee232c6f9bf2b440a70e5c29c60eb9109ee99f1deb4e71eed611711d4' 
  AND token = '50wke4165cdRlEYxPEU/De/J0Ehx89Tmcyb5XBUTmLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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