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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9abd8cccaf10d3b07af7d999c5e103d10a0ce4a1c9ae0a56f099d40e732be1a' 
  AND token = 'mTQpb0pnNvxoNE3bKNxyYz7rFtS7UPUKCEbClw5S53Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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