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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '325c612237feefdd36f1dd893b6e2a0b869d241ef5a4e931c6d719c9eee79c68' 
  AND token = 'NfopBhXw5kKtHS9OBQqJ41E4m4OcyguBf28kOk4yG04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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