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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd40a5f679e534b14807bc79f03a7f561de00612898ca03a360b0fb249f891fb' 
  AND token = 'NKyrM6bJ1RroxIGwBeN0vzSYmWdXYsx39Ol3Hlerdp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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