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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e29f70b30c2459a90eb57bc37cb5003a035b7685e2f22773659101ed00412fe' 
  AND token = 'qqWxFmlq8W7ZeKv4PHCdmrXCBTpEN9JIo0AoMUE6UfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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