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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d958eb90a4dcd29e2ae3962c5572d81cf4ed4beee24455415c3aa0f8dd8a3e8' 
  AND token = 'qhOqqCe6rjSQRBWBN1aiSNp/eVGogSMu5nQIMafzhqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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