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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8f6a97d4220d1d69bed322091ecbc4c455142069e3ab50017b7660065652523' 
  AND token = 'E49ajp2EHTBrZ/bDsuSu0C0lyjZGw2tUX3grXZh3JkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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