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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cb7bb55e523c6b3eacf1cf7a58784863c8237ebc1f75aa393eb5feb2e23a835' 
  AND token = 'Q8LcRD7ztdNJj129pmtdfY4SeKk66mV+fPneOBh2m0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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