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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed321520c0cec982773f966ee1c9b569012c798e53fe94fe31c54af8408eafd6' 
  AND token = 'Y1h7AdhW3GA31cIqWkV7dNcLaAlx4wUvNNc51g68xSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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