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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4574298c150aeb0612c1f71cb2f797575dc6acf90c8003379c0bfa719cff5bfb' 
  AND token = 'xeACeY+GNDaQjTJfrBBpVNQ5B/GKJaptV1yxx2zUA2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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