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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afe9b336da444e6d7ca19c872bf7edcd417980377fa9ccf78852b74f34bd80f3' 
  AND token = 'MObVqG5vV8ovxKD9cogtNMKOceeET3OKLtmnZXQ43i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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