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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1b9a5dfdc64f133ebdcf91baf1d4a256dac35a70be756029dc6647e51da805c' 
  AND token = 'Uo7OJrsDdKuExmu9Did9+bFuPdfnajNRNLrQmN3BpTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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