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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '718b7bb1d9cb857a0a388a29940b891dc79765d7e0ef6ed13c05133810d36f63' 
  AND token = 'C32Fx4e9mEhRt/ixwyC0zNmQ+3K18UdZcZQhyzYNoDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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