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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '874ed2ac3a51d363493a79f839fdec49ed729445794f7a65ca3a2c8400f45aa0' 
  AND token = '2efbnUTCBfhyTEoPvSdYk6sbURhFKgROHUsDSAIp9Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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