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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eee613d0d18ad78bfebe889a76cb6e03405778525eac52f2b0edf9f9fe2fc40' 
  AND token = 'th5ABeP9YRVply+bh5jVl7dF9WdByEfl3DX4c+0ifnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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