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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '269e15daeeff35314349228e904d936597c82a66bd9dae473699bff56830ce2a' 
  AND token = 'isexLxNAtyD6SKAzmM5QlBIiSAHd3u8YIURyvDcFlFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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