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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a431e66650046cf8a0ce065d376080aed2319ea225ab229162d90be31f0d9ac4' 
  AND token = '6a0S7SJooPFZURuF/k/EIwvCXKa1fsVwxeS7t/QboYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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