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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80c04c0d4aabead62790ebf84749f34df59cfb902ea79b1a4df2822e9b1c2a95' 
  AND token = 'xQPA2x7ZEeERRobRvxkcyL7dNPeEIB2surVTLjqAwc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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