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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aff73528c839411294cfb45b16bc428d71d3e393e48e27c932f3d595d4ff99e4' 
  AND token = 'sEhi48ShxyelICIwLZ0H8nQv4KZN6IpM++V7+V+n1H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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