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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e84c704f662cd4a0931d839fddd1bbc52b5faa71dc6f21eb636a344d197dc9a' 
  AND token = 'uyAWdF2TZM3OdnDxZMQWya0b0J+cdIDnPmj9d1CObto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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