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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '682d6658ea8ea774b2ae7a9316d807719f6f678c936d77913d71566ddc3fa8d6' 
  AND token = 'ES30c40MC4PhZPIXNGKwX3hWD1EOmQTG1kCqsjCRq8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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