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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04d4e7367531483d9ebd7fcfbdbff7a91e78b7913e1c4f8a83ae7ed945934f97' 
  AND token = 'Q/atiiShjc0BBB6YQxSyKyDi6BhWC/8r0SOXRP+E6AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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