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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7355780159f0a7fe2d7b5d66f726e805d4895379b11d6e2b6a5e69a0b6ac2ed' 
  AND token = 'sftu3+AQSKiXbrq+ae2UW+LWMrEiHFe7Pn8I6kKrcEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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