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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68beb101d914a65a7f5569d3791ba64a1dd3d32fb221af349314c6180448775a' 
  AND token = 'GbMuuuIzeIQTWTXLXPyKk1up+2804A3T7ct5GivtRPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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