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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1544f6c10c7f912d9f7ea3994908c80ff35f9dec5b67bc6351878377c2b1d4f6' 
  AND token = 'lLVD2aIHihgOdDR0gJ4xUAQ2R1mI1I7lO+lCCEzsfcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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