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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '679052e93976ee82a5e737c1697754395d38d4098b576cb8ffe5e68ddea0e34c' 
  AND token = 'UQ88pbzbPPz5h1IBl8J13ESUCXWwcL4ShUmL9Of0WyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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