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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51de2df7976629b6c23d576d31c6817e1434146a9e69b7fcc4a61c4f9e228887' 
  AND token = '5PwbsBAPyHpMGIiAcvp1zISYqRx7+6v8L9geX5EkgNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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