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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03819f7869f2407e2c4326e58ea9e45711ed4990df9aa0fd769474baec0a30ad' 
  AND token = 'b/+I4bCB0EDVy0TITnWmnBT1A5FbxF9MIW9zNsR1TjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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