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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21b086a88d290604d4bd5a4219a6ae5102c915c58fb88c79d137b64d305a26cd' 
  AND token = 'NsBtuk7TfKEAMsuBT3JLGs4HiTLrab9nMSIh6MtG3ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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