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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce44f31e0ee7922db81be24ea32ca33b5d69dc9764ca6b591b507f195251c84f' 
  AND token = 'xkJMK45izeic+f29MAYZXvcMco1XqumlGI4huI2stUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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