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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96a8791e8e7dd90f66b2eb0ab2c69022c151735ac9055443f388c5b6da6dd53c' 
  AND token = '/0yWbCxrSOw/flN+EiA99Dmi4fAF9cnwTJRRqs1o7gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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