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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20e4641a7d7d8b74e15ea3fe7bd9142a75388484f7cf3e0e86119cb7a72a3319' 
  AND token = 'dozZ8K7Im/7kdoYrUQaspYoStEdRyQvrLa1E096kn0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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