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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91035c5229e0e541cf97072833426d55b606e92abf28e83c583bac7966859910' 
  AND token = 'i98ULfZoCrFt83uAmQrS+0BwgTPTZdyjaQ0E2r9+IWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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