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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b176fd6c500b85ba15253e5c58fe2c2d1b3eacf1308321d4c0fa425e7a7d3146' 
  AND token = 'xfRqZTL/ehG8ryphoz4tEqxu3j9om0llrZMPnehtCOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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