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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e03dbb3acdd6486533a8b6cfbb56b95fae9a6adabd0f1531595e773a3ae8afe' 
  AND token = 'z14AKA6UIbUoxRtMoqXwO0Gr39bnxGfXx5Hy8LNUF5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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