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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f83241c9b9c8fbcd8fab739db797c0397a29dea3a0353c9a7632dfb97361e12' 
  AND token = 'qt/0ZFyA0DsPUR1G5lL4t9i4PZSlg5vM3t1QPJUpoqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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