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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8129e0d8fca1e839c49fecad20afdd1dc0ac3b6ed01cde3c737dceb367a2936' 
  AND token = 'vPwSF+mcgjR4Rka+WG0644Tg4wOk8/OqziI7zKHnPVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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