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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c305d949ed529f779b621811b9aba4ee96bedc17e8d4dc834f80eaae2125e7f2' 
  AND token = '5nti3FBChfEvtJYlaPvPoVbh/2YhC9bAmbB8oWMlr+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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