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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6518cf0172d0d56544ae7d568b23a741b4cc3117944baaf2ad507b0c73bc85fb' 
  AND token = 'cuwWz9TYvcctdvUfIGIUR7BNndVLRjs9dvISOqoDfQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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