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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1465f257db77e2c1ecd4be811ee816c5ce7a775c113dfe34a47547b6cfbc1702' 
  AND token = 'PEvuEmJZA+YD5xanM0/vTHlV33wMoEvvJGUrWmMCL4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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