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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36c296af52d82fe50bda73703b9dd0ea9372d5c148e635a8950e26ccad97be81' 
  AND token = 'wSaGfPFxtdGwbyl3qPDdNtmNI6tSk62u79apT2dOECg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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