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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6d3c06e44bef0f27bbaaa96ee0dffc9dfd26ad583fd07cc2682dda7b377c8b6' 
  AND token = 'FS7EfHpcJROGV9/b92snJWFWPwI//6Kr4y3lXr8LFtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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