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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b8a84227de4c018d22ed014210669976c0ca6c90f47cc8cd2a0c7657777738a' 
  AND token = '9V4HRlBI1g7dLWtQoOMb9mwwnk82ip7NqLufH2nX/LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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