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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b330b0b770bde3b9159dca2d0fe2d8f50110c4419acd4efc858de79d4d1eaf3b' 
  AND token = 'hj6wSgGvUbDbMKsj74r2OfCkhOp3T2mAjxFCEMiXKAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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