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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fecd25dcb2f54a561863f2c0cf36da536bc12ed51fb2211d7a6e0d87875a529' 
  AND token = '9w7gKlTNZ4Fb5uXyODrr5FWUBDQZ2rK8wgcaGlZipTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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