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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73209642f3542df7aafe5d63b63f14f838c3f5dfd4ffe7de64c3faf7f6916398' 
  AND token = '45capNPam+6FIaUhhE5B9Vp0JGofE3aQLeTKrNuE2Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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