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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28ca6a8a09ccd3dbc0b39f59083d0f9dc9db8ad386858b8e81e40b272d5cf639' 
  AND token = 'wpoCwBtSK+1lpbVTv3bTAL6sT88saWVtmjSXpmSa/SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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