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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99e93c86afb7a316d2b3731046906f729399088e63e4c74e738c5702b4aa4cc3' 
  AND token = 'ZhzwfhG96bID1gOJltImTGHsRSGpHkaL48hEfUfGUW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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