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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad0135d1f66fb01134b0704a78e9220c4638e2636fcf877ddc0bdd2130a27bf6' 
  AND token = 'PtgWddXpYXuphtYgtE2yjGj1obfWU0kJfSRdI6U9HC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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