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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f7e180e6f2506222d9b394cb9094992d567094d28f76c864c6cbc06a884ab59' 
  AND token = 'xPxOVWDU4l2XkpszW33IxEKFyRkRjlWFBVZT9864aKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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