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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fee7756ed38452f71b886561cd04d2ea23d34d56354538e80c56cfd613fbce3' 
  AND token = 'XYo7NsX1iXJGNs1dqDfbsylk8hfGbnmXEf+1stbcdnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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